浅议华南陆块群的沉积大地构造学问题

华南陆块群指我国南方一系列大大小小的古陆块，包括扬子陆块、武夷陆块、云开陆块等在内，它们连同所在海域构成多岛海。这些古陆块在古生代早期曾位于冈瓦纳大陆边缘，在晚古生代至中生代早期不断拼合，成为亚洲大陆的一部分。华南陆块群的大地构造演化特征可概括为12个字:“小陆块、晚拼合、弱张裂、强挤压”，而其陆内变形则以“多动力、广分布”为特征。华南陆块群演化中有几个悬而未决的沉积大地构造学问题:（1）华夏陆块与扬子陆块是否存在过华南洋？早古生代时华南陆块群的沉积作用有何特征？（2）伴随晚古生代张裂活动和岩浆活动，华南陆块群晚古生代沉积环境和古地理发生了哪些重要变化？（3）华南陆块群中生代陆内变形有哪些沉积响应？相信对这些问题的逐步解决将会有助于深入认识华南地质，并丰富大陆动力学的知识宝库。

Preliminary Discussion on Sedimentary Tectonics of the Clustered Continents of South China

The clustered continents of South China (CCSC) is a group of Early Paleozoic continental blocks including the Yangtze block, the Wuyi block, and the Yunkai block. The CCSC and its surrounding sea compose an archipelago. The CCSC was located in northern margin of Gondwana during the Early Paleozoic and collaged to Eurasia during the Late Paleozoic and the Early Mesozoic. The tectonics of the CCSC is characterized by small size, later collage, weak extension, and strong compression, while the innercontinental deformation of the CCSC is characterized by multiple engine and wide range. Some important unanswered questions include: (1) has ever been an oceanic basin between the Yangtze and the Cathaysia blocks? What is the nature of sedimentation of the CCSC? (2) What is the impact of the Late Paleozoic extension on changes of paleo environment and paleogeography of the CCSC? (3) What is the sedimentary response to the innercontinental deformation of the CCSC? Approaching to these questions will help understanding geodynamics of the South China and accumulating knowledge of continental dynamics.